March weather forecast and climate
Seattle, WA

Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
March is the start of spring in Seattle. It is characterized by a further drop in humidity to 73.1% and a significant rise in temperatures to the range of 37.4°F (3°C) and 53.6°F (12°C) making the weather warmer and more pleasant, especially with the five daily hours of sunshine. Snowfall is experienced only in the first few days of the month with the low accumulation of only 0.8" (20.3mm).
Sixteen rainy days result in moderate precipitation of 3.9" (99.1mm), lowering the monthly wetness considerably. Carrying an umbrella is still essential. Sea fun is still a no-go zone as the temperatures are still low at 46.4°F (8°C).

What is the temperature in March in Seattle?

In Seattle, Washington, in March, the average high-temperature is 53.8°F (12.1°C), and the average low-temperature is 39.4°F (4.1°C).

How much does it rain in Seattle in March?

In Seattle, in March, it is raining for 16.9 days, with typically 3.7" (94.5mm) of accumulated precipitation.

What is the last month it snows in Seattle?

March is the last month it regularly snows. During 0.5 snowfall days, in March, Seattle aggregates 0.8" (20.3mm) of snow.
Average temperature in March - Seattle, WA
  • Average high temperature in March: 53.7°F

The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (45.7°F).

  • Average low temperature in March: 39.3°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (35.6°F).

Average humidity in March - Seattle, WA
  • Average humidity in March: 73.6%

The month with the highest relative humidity is December (80.1%).
The month with the lowest relative humidity is July (65.4%).

Average rainfall in March - Seattle, WA
  • Average rainfall in March: 3.7"

The wettest month (with the highest rainfall) is November (6.6").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in March - Seattle, WA
  • Average rainfall days in March: 16.9 days

The month with the highest number of rainy days is November (18.4 days).
The month with the lowest number of rainy days is August (4.8 days).

Average snowfall in March - Seattle, WA
  • Average snowfall in March: 0.8"

Months with the highest snowfall are February and December (1.7").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in March - Seattle, WA
  • Average snowfall days in March: 0.5 days

The month with the highest number of snowfall days is December (1.6 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in March - Seattle, WA
  • Average sea temperature in March: 45.8°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

Average daylight in March / Average sunshine in March - Seattle, WA
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in March: 5.8h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 1.7h).

Average UV index in March - Seattle, WA
  • Average UV index in March: 3

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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